William Houser, 36, of the 3400 block of North Carlisle Street, surrendered on Thursday morning to face aggravated assault charges.
It happened at the Dunkin Donuts store located on the 4700 block of North Broad Street in the city's Fern Rock section on Wednesday, January 8th.
Investigators say it began with an argument after Houser tried to use a coupon on his iPhone, but was told by the clerk that it expired.
The suspect got enraged but still paid for his coffee.
Then the suspect, identified as Houser, gets into another argument with the employee but appears to be leaving - when something is said to set him off again.
That's when the suspect comes back and hurls the coffee at the employee.